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ACS710
120 kHz Bandwidth, High Voltage Isolation
Current Sensor with Integrated Overcurrent Detection
Setting Overcurrent Fault Switchpoint
Setting 12CB and 25CB Versions
The V OC needed for setting the overcurrent fault
switchpoint can be calculated as follows:
V OC = Sens × | I OC | ,
where V OC is in mV, Sens in mV/A, and I OC (overcur-
rent fault switchpoint) in A.
| Ioc | is the overcurrent fault switchpoint for a bi-
directional (AC) current, which means a bi-directional
sensor will have two symmetrical overcurrent fault
switchpoints, +I OC and –I OC .
See the following graph for I OC and V OC ranges.
I OC versus V OC
(12CB and 25CB Versions)
I OC
0.4 V CC / Sens
Not Valid Range
Valid Range
0.25 V CC / Sens
0
0. 25 V CC
0. 4 V CC
V OC
– 0.25 V CC / Sens
– 0.4 V CC / Sens
Example: For ACS710KLATR-25CB-T, if required overcurrent fault switchpoint is 50 A, and V CC = 5 V, then the
required V OC can be calculated as follows:
V OC = Sens × I OC = 28 × 50 = 1400 (mV)
Allegro MicroSystems, LLC
115 Northeast Cutoff
Worcester, Massachusetts 01615-0036 U.S.A.
1.508.853.5000; www.allegromicro.com
15
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